英文關鍵字
aerial
big
black
bucket
capacity
carbon
coal
conveyor
copper
crane
cut
dig
dirt
dirty
drilling
drone
earth
energy
engine
equipment
excavator
extracts
field
fossil
fuel
geology
giant
ground
heavy
horizontal
huge
hydraulic
industrial
industry
large
loader
machine
machinery
mine
miner
mineral
mining
plant
power
production
quarry
rock
shearer
technology
that
transportation
tunnel
underground
urban
wheel